William C. Bowen, Josiah Bartlett, Francis Moore, James Thacher, Dr. John Stockbridge, Dr. Caleb Miller, John Winslow, A. Brooke Faulkland, A. Colles, Messrs. Le Gallois, M. Le Gallois, Baron Larrey,
... Reptiles and Rabid Animals Denominated Algalia, Yerba Del Sapo, or Contra Culebra [Communicated for the New-England ...
1814 - Gale Group | NCCO-STM 1of2
Robert T. Thomson, Consuelo Montes, Mark E. Davis, E.E. Wolf,
Palladium impregnated on silicoaluminophosphate molecular sieves (SAPO-5, SAPO-11, SAPO-34) and alumina has been studied during CO hydrogenation. Pd/SAPO-5, which exhibited the highest turnover frequencies, initially ... of C2-C4 alkanes were observed over Pd/SAPO-34, reaction over Pd/SAPO-11 and Pd/Al2O3 yielded only oxygenates. Methane ... increased significantly with higher temperature, particularly over Pd/SAPO-5. Higher H2 partial pressures increased oxygenate production ... ZSM-5 indicate that hydrocarbon synthesis over Pd/SAPO catalysts occurs via a bifunctional pathway, involving methanol ...
Tópico(s): Catalytic Processes in Materials Science
1990 - Elsevier BV | Journal of Catalysis
D. D. Bartholomew, Prof. S. Lilienthal, Prof. H. Senator, E. A. Lodge, Louise Clark-Pyrnelle, Mary Rose Banks, Henry N. Guernsey, Henry Hyde Salter, Morris Longstreth, William Allingham, W. P. Armstrong, Graily Hewitt, Clifford Mitchell, Henry Thomas, J. K. Baudy,
... in Nervous Diseases, Etc., On Therapeutical Use of Sapo Viridis, Convallarine (Lancet), Alcohol as a Therapeutic Agent. ...
1882 - Gale Group | NCCO-STM 1of2
... catalytic activity in the conversion of decane on SAPO-5, SAPO-11, and SAPO-37 samples with Si T-atom fractions ranging ... individual crystals, the overall chemical composition of a SAPO-n sample is unable to rationalize its catalytic ... In order to explain the catalytic activity of SAPO-5, SAPO-1 l, or SAPO-37 materials, the contributions of aluminosilicate (SA) and ...
Tópico(s): Crystal Structures and Properties
1990 - Elsevier BV | Journal of Catalysis
Lucien Howe, Thomas Lothrup, Luther Holden, E. P. Fowler, Dr. Fred. Heman Hubbard, T. Milner Fothergill, Dr. Edward T. Bruen, E. F. Smith, John Marshal, A. D. Rockwell,
... Senses, Vaccination a Relic of Barbarism, Inunction of Sapo Viridis in Scrofula, Selections Vaginal Chancres, Hypertrophy and ...
1882 - Gale Group | NCCO-STM 1of2
Yang Wen-shen, Xiufeng Liu, Liu Zhang, Baoquan Zhang,
The synthesis and microstructure manipulation of SAPO-5 films on porous α-Al2O3 substrates (samples F-1 through F-6) have been studied with the main focus on the ... thin layer. Without the chitosan layer, the supported SAPO-5 film synthesized under traditional heating is not ... holes or crystal boundaries. The preferentially c-oriented SAPO-5 top-layer over a closely packed layer of SAPO-5 crystals was synthesized on the porous α- ... diffraction (XRD), the thickness of the c-oriented SAPO-5 top-layer is changed from 1.5 ...
Tópico(s): Metal-Organic Frameworks: Synthesis and Applications
2009 - American Chemical Society | Langmuir
Karina Mathisen, Michael Stockenhuber, D. Nicholson,
Cu:SAPO-5 and Cu:SAPO-11 were prepared by conventional and hydrothermal ion exchange. Copper incorporation is increased six-fold by hydrothermal ion exchange relative to ... cases, the amount of copper taken up by SAPO-11 is superior to uptake in SAPO-5. Copper is divalent and in tetragonally-distorted ... ray absorption spectroscopy (XAS). For both the Cu:SAPO-5 and Cu:SAPO-11 systems, heating in helium partially autoreduces copper( ... attributed to bidentate copper were observed for Cu:SAPO-11/HT. For all four samples NOx partially ...
Tópico(s): Luminescence Properties of Advanced Materials
2009 - Royal Society of Chemistry | Physical Chemistry Chemical Physics
Yasuyoshi Iwase, Ken Motokura, Toru Koyama, Akimitsu Miyaji, Toshihide Baba,
To investigate the effect of SAPO-34 particle size (with a fixed Si mole fraction in its framework) and that of the Si mole fraction (in a SAPO-34 framework with fixed particle size) on propylene ... rate for the conversion of ethylene to propylene, SAPO-34 was prepared by hydrothermal synthesis using tetraethyl ... ethylene was carried out at 473 K using SAPO-34. The selectivity for propylene, the rate of ... strongly influenced by the catalyst crystal size. The SAPO-34 with a approximately 2.5 microm particle ...
Tópico(s): Metal-Organic Frameworks: Synthesis and Applications
2009 - Royal Society of Chemistry | Physical Chemistry Chemical Physics
Zeeshan Nawaz, Xiaoping Tang, Jie Zhu, Fei Wei, Shahid Naveed,
Three SAPO-34 catalysts, 100% SAPO-34, 30% SAPO-34, and meso-SAPO-34, with different bulk topologies were prepared. The catalysts were characterized by N2 adsorption, ... was studied using 1-hexene cracking. On 30% SAPO-34, the surface acidity and diffusion rate decreased ... by binder, which adversely affected catalytic activity. 100% SAPO-34 gave better cracking ability and higher propylene ... order to study the effect of diffusion, meso-SAPO-34 was used. The different bulk structure gave ... was observed in the cracking by the meso-SAPO-34 and 100% SAPO-34 catalysts, in which ...
Tópico(s): Mesoporous Materials and Catalysis
2009 - Elsevier BV | CHINESE JOURNAL OF CATALYSIS (CHINESE VERSION)
Shih-Tsung Yang, Sandy I Ching Wang, Chenwei Huang,
... large, medium and small pore silicoaluminophosphate molecular sieves, SAPO-5, SAPO-11 and SAPO-34, were studied. Small pore SAPO-34 favors the formation of lower olefins, medium pore SAPO-11 favors the formation of C 5 and C 6 + hydrocarbons, while large pore SAPO-5 favors the formation of C 7 hydrocarbons. ... toward lower olefins increase with increasing temperature over SAPO-5 and SAPO-34 and also increase with increasing silicon content of SAPO-11. Lowering the partial pressure of methanol increases ...
Tópico(s): Catalytic Processes in Materials Science
1991 - Elsevier BV | Studies in surface science and catalysis
Mahuya Bandyopadhyay, Rajib Bandyopadhyay, Shogo Tawada, Yoshihiro Kubota, Yoshihiro Sugi,
Silicoaluminophosphate (SAPO) molecular sieves, SAPO-5, SAPO-11, SAPO-20 and SAPO-34, were successfully synthesized by a novel dry-gel conversion method. The isopropylation of biphenyl (BP) with ... over these molecular sieves, with more emphasis on SAPO-5. SAPO-5 exhibited high selectivity for 4,4′-DIPB (65%) with high BP conversion (89%). SAPO-11 showed high selectivity for 4,4′-DIPB with low conversion, whereas SAPO-20 and SAPO-34 had only low activities ...
Tópico(s): Polyoxometalates: Synthesis and Applications
2002 - Elsevier BV | Applied Catalysis A General
A. Buchholz, Wei Wang, A. Arnold, Mingyu Xu, Michael Hunger,
... flow of dry nitrogen. The hydration of H-SAPO-34 and H-SAPO-37 is composed of two successive steps, viz. ( ... of water to aluminum atoms. In hydrated H-SAPO-34, the hydration-induced transformation of tetrahedrally coordinated ... the experiments. In the case of hydrated H-SAPO-37, the dehydration of octahedrally coordinated aluminum atoms ... molecules to the aluminum atoms than in H-SAPO-34. This indicates an immediate hydrolysis of the H-SAPO-37 framework. Since no defect SiOH groups were observed upon hydration and dehydration of H-SAPO-37 at T=298 K, the hydrolysis of ...
Tópico(s): Crystal Structures and Properties
2002 - Elsevier BV | Microporous and Mesoporous Materials
Juan Tan, Zhongmin Liu, Xinhe Bao, Xianchun Liu, Xiuwen Han, Changqing He, Runsheng Zhai,
In this study of the synthesis of SAPO-34 molecular sieves, XRD, SEM, XRF, IR and NMR techniques were applied to monitor the crystalloid, structure and composition changes of the samples ... crystallization as well as Si incorporation mechanism of SAPO-34. XRD results revealed that the crystallization contained ... could be achieved and the crystal size of SAPO-34 was almost the same as that of ... this stage, IR revealed that the formation of SAPO-34 framework structure was accompanied by the diminution of hydroxyls, suggesting that crystal nuclei of SAPO-34 may arise from the structure rearrangement of ...
Tópico(s): Crystal Structures and Properties
2002 - Elsevier BV | Microporous and Mesoporous Materials
I. Eswaramoorthi, N. Lingappan,
Silicoaluminophosphate molecular sieves SAPO-5 and SAPO-11 were synthesised hydrothermally and their purity and structure were checked by X-ray diffraction (XRD). The calcined SAPOs were impregnated with 0.2 wt.% Pt and ... total acidity of the catalysts. The Ni-Pt/SAPO-5 and Ni-Pt/SAPO-11 catalysts were subjected to n-hexane hydroisomerisation ... 4 wt.% over 0.2 wt.% Pt loaded SAPO-5 and SAPO-11 increases the n-hexane conversion, isomerisation selectivity, ... 2 wt.% Pt and 0.4 wt.% Ni/SAPOs in n-hexane hydroisomerisation was compared with 0. ...
Tópico(s): Polyoxometalates: Synthesis and Applications
2003 - Elsevier BV | Applied Catalysis A General
J. Chen, Paul A. Wright, Srinivasan Natarajan, J. M. Thomas,
SAPO-5, SAPO-17, SAPO-18 and SAPO-34 were successfully synthesised. The bridging Si-OH-Al groups (Brønsted acid sites) in these SAPOs were observed by means of diffuse reflectance infrared ... the Brønsted acid sites is in the order SAPO-5<SAPO-17<SAPO-18<SAPO-34. SAPO- ...
Tópico(s): Crystal Structures and Properties
1994 - Elsevier BV | Studies in surface science and catalysis
Crystalline microporous SAPO-5 molecular sieves with different silicon content, acid-treated SAPO-5 and Na-exchanged SAPO-5 were investigated far their thermal stability, and acidic and catalytic properties. SAPO-5 materials with increasing Si framework content exhibited ... in the number of strong acid sites on SAPO-5. The TPD of pyridine over SAPO-5, acid-treated SAPO-5, and Na-exchanged SAPO-5 indicated the presence of two types of ... has also been obtained. The catalytic activities of SAPO-5 catalysts in the ethanol, n-hexane, isooctane, ...
Tópico(s): Metal-Organic Frameworks: Synthesis and Applications
1994 - Elsevier BV | Journal of Catalysis
Ramesh B. Borade, Abraham Clearfield,
Silicon substituted AIPO molecular sieves (SAPO) of the structure types 5, 11, 34 and 37 have been synthesized and characterized for crystallinity and phase purity using X- ... The incorporation of silicon into the framework of SAPO materials was demonstrated by 27Al, 31P and 29Si ... a Brønsted band and in the case of SAPO-34 molecular sieve absence of both, Brønsted and ... and Lewis bound pyridine on the surface of SAPO-34 molecular sieve. The N/Si ratio of close to one observed for SAPO-37 was interpreted to mean that in this ...
Tópico(s): Radioactive element chemistry and processing
1994 - Science Press | Journal of Molecular Catalysis
Niu Li, Yanfeng Ma, Wenbo Kong, Naijia Guan, Shouhe Xiang,
... the phosphorus source to synthesize chabazite structure silicoaluminophosphate (SAPO) molecular sieves, SAPO-34, SAPO-44, and SAPO-47. It has been found that the directing ... known organic bases for directing the formation of SAPO-34. However, when H3PO3 or the mixtures of ... phosphorus source, the directing product has changed from SAPO-34 to SAPO-47. Raman investigation has shown that there are ... P(III) species in the intermediates for crystallizing SAPO-47. It means that chabazite structure SAPO molecular ...
Tópico(s): Glass properties and applications
2008 - Elsevier BV | Microporous and Mesoporous Materials
Shengzhen Zhang, Sheng‐Li Chen, Peng Dong, Guimei Yuan, Keqi Xu,
Abstract Silicoaluminophosphates SAPO-11 molecular sieves were synthesized from a conventional aqueous medium, a two-liquid phase medium and a HF ... 29 Si MAS-NMR. The morphologies of the SAPO-11 molecular sieves obtained from the conventional aqueous ... μm assembled from cubic plate microcrystallites, whereas the SAPO-11 molecular sieves synthesized from the HF medium ... highly influenced the number and the strength of SAPO-11 acid sites. Compared to SAPO-11 obtained from conventional aqueous medium, SAPO-11 ...
Tópico(s): Mesoporous Materials and Catalysis
2007 - Elsevier BV | Applied Catalysis A General
Kun Wang, Guang Cao, Gordon J. Kennedy, Mobae Afeworki, Richard E. Bare, Richard B. Hall,
The pore structure of a microporous material H–SAPO-34 is modified using organometallic reagents such as ... the modified material is obtained (designated as H–SAPO-34/ZnMe2). H–SAPO-34/ZnMe2 is different compared with framework incorporated ZnAPSO-34 and zinc cation exchanged Zn/SAPO-34. Diffuse Reflectance UV/vis (DRUV) reveals a ... transfer band (202 nm → 195 nm) for H–SAPO-34/ZnMe2, indicating perturbations to the SAPO-34 framework as a result of ZnMe2 modification. ... OH attaching to the framework oxygen in H–SAPO-34/ZnMe2. The reaction of ZnMe2 with H– ...
Tópico(s): Polyoxometalates: Synthesis and Applications
2011 - American Chemical Society | The Journal of Physical Chemistry C
Peng Tian, Xiong Su, Yingxia Wang, Qinghua Xia, Ying Zhang, Dong Fan, Shuang-He Meng, Zhongmin Liu,
SAPO-34 and a novel SAPO molecular sieve with the RHO framework (designated as DNL-6) were synthesized using SAPO-5 (the denser phase) as the precursor and ... mediated transport mechanism attributed to the transformation from SAPO-5 precursor to SAPO-34 via oscillating phases [SAPO-5 (FD = 16.9 T/nm3) => SAPO-34 (15.1) + DNL-6 (14.5) → DNL- ...
Tópico(s): Chemical Synthesis and Characterization
2011 - American Chemical Society | Chemistry of Materials
Tizhuang Wang, Xuchen Lu, Yan Yan,
SAPO-34 molecular sieve was hydrothermally synthesized using metakaolin as the single Si and partial Al source. Crystallization mechanism of SAPO-34 and transformation processes of metakaolin were investigated ... adsorption–desorption and NMR. The results showed that SAPO-34 with high purity could be prepared within a wide range of metakaolin content. Synthesis of SAPO-34 with all Si in isolated state demonstrated that SAPO-34 crystallization proceeded by a solution–mediated transport ... increase of Si content in the newly formed SAPO-34 lattice. Transformation processes of metakaolin were followed ...
Tópico(s): Glass properties and applications
2012 - Elsevier BV | Microporous and Mesoporous Materials
Qing Ye, Lifeng Wang, Ralph T. Yang,
... ZSM-5 and chabazite-like zeolites (SSZ-13, SAPO-18 and SAPO-34) were studied for selective catalytic reduction (SCR) ... propene. Cu/ZSM-5, Cu/SSZ-13, Cu/SAPO-18 and Cu/SAPO-34 exhibited high NO conversions without propene. However, ... 5, NO conversions over Cu/SSZ-13, Cu/SAPO-18 and Cu/SAPO-34 were more stable with propene, due to ... between fresh and used Cu/SSZ-13, Cu/SAPO-18 and Cu/SAPO-34 catalysts. Moreover, Cu/ZSM-5 catalyst showed ... of propene compared to Cu/SSZ-13, Cu/SAPO-18 and Cu/SAPO-34 catalysts. The resistance ...
Tópico(s): Catalysis and Oxidation Reactions
2012 - Elsevier BV | Applied Catalysis A General
Shaofeng Gong, Ning Chen, Shinji Nakayama, Eika W. Qian,
Several Pt catalysts with various solid acid supports (SAPO-11, Al-SBA-15, and Al2O3) and various SAPO-11 supported active metal (Pd, Ni, Ru, Pt) ... a fixed bed flow reactor system. All Pt/SAPO-11, Pt/Al-SBA-15, and Pt/Al2O3 ... alkanes with long carbon chain. Especially over Pt/SAPO-11 catalyst, a high yield of iso-C10– ... the absence of strong acidic sites of Pt/SAPO-11 catalyst. With an increase in reaction temperature, Pt/SAPO-11 catalyst still showed a high ratio of ... formation of multibranched product. The catalytic activity of SAPO-11 catalysts containing various active metals decreased in ...
Tópico(s): Biodiesel Production and Applications
2012 - Elsevier BV | Journal of Molecular Catalysis A Chemical
Ocean Cheung, Qingling Liu, Zoltán Bacsik, Niklas Hedin,
Silicoaluminophosphates (SAPO-17, SAPO-35, SAPO-56 and SAPO-RHO) synthesised via hydrothermal means are tested for their abilities to adsorb carbon dioxide. These 8-ring microporous phosphates show high capacities to adsorb CO2. SAPO-RHO has a high uptake of CO2 and ... is rationalised by a temperature induced shrinkage effect. SAPO-56 has a slightly higher CO2 capacity (5. ... and in situ infrared spectroscopy (IR) reveal that SAPOs retain 95% of their original CO2 capacity after ... 0.2–0.7 mmol/g loading) on SAPO-56 and SAPO-RHO lies in the physisorption ...
Tópico(s): Carbon Dioxide Capture Technologies
2012 - Elsevier BV | Microporous and Mesoporous Materials
Narendra Kumar, José Ignacio Villegas, Tapio Salmi, Dmitry Yu. Murzin, Teemu Heikkilä,
... as sources of aluminium in the synthesis of SAPO-5. The samples were characterized using XRD, SEM, XRF, FTIR and nitrogen adsorption. The formation of SAPO-5 phase, morphology, surface area and catalytic properties ... Brønsted and Lewis acid sites in the Pt-SAPO-5, SAPO-5, Pt-H-mordenite and H-mordenite catalysts. Modification of SAPO-5 and mordenite by Pt impregnation did not ... n-butane and yield to isobutane than Pt-SAPO-5 and SAPO-5 catalysts with weak acid sites. Introduction of Pt in SAPO-5 and mordenite played a positive role in ...
Tópico(s): Mesoporous Materials and Catalysis
2005 - Elsevier BV | Catalysis Today
Xiaolin Ren, Na Li, Jian Cao, Zijian Wang, Song Liu, Song Xiang,
A series of SAPO-41A zeolites with different silicon contents was hydrothermally synthesized from a new route by using phosphorous acid (H3PO3) as ... acid sites but also the acid strength of SAPO-41A. The excellent performance of the hydroisomerization of n-decane can be obtained over SAPO-41A with proper silicon content in the framework. ... of platinum supported on different types of zeolite (SAPO-41A, SAPO-41B, SAPO-11, MCM-22, Hβ) were investigated for the ... activity due to their strong acid sites. The SAPO-based catalysts showed better catalytic performance for the ...
Tópico(s): Catalysis and Hydrodesulfurization Studies
2005 - Elsevier BV | Applied Catalysis A General
Anand Prakash, C.V.V. Satyanarayana, Rahul P. Bagwe, Sunil Ashtekar, D. K. Chakrabarty,
Medium pore molecular sieves SAPO-11, SAPO-31 and SAPO-41 have been synthesized using di-n-propylamine as the organic template. They have been characterized by various methods ... of toluene with methanol have been studied. While SAPO-11 and SAPO-31 showed moderate activity, very high catalytic activity was shown by SAPO-41. All the catalysts showed varying degrees of shape selectivity towards p-xylene. SAPO-41 gave a large amount of 1,2, ...
Tópico(s): Mesoporous Materials and Catalysis
1996 - Elsevier BV | Microporous Materials
Anand Prakash, Tomasz J. Wąsowicz, Larry Kevan,
Medium-pore silicoaluminophosphate type 41 (SAPO-41) molecular sieve has been synthesized by hydrothermal methods. The reducibility of Ni(II) ions ion-exchanged into SAPO-41 (NiH−SAPO-41) by various reduction methods was studied by electron spin resonance spectroscopy. Dehydration of NiH−SAPO-41 at temperatures above 573 K produces an ... g⊥ = 2.115. When dehydrated and oxidized NiH−SAPO-41 is treated with hydrogen, more than one ... observed depending on the reduction temperature. When NiH−SAPO-41 is γ-irradiated at 77 K, Ni( ...
Tópico(s): Mesoporous Materials and Catalysis
1996 - American Chemical Society | The Journal of Physical Chemistry
Zhidong Zhu, Martin Hartmann, Larry Kevan,
... from methanol to olefins has been studied for SAPO-11, SAPO-34, and SAPO-35 silicoaluminophosphate molecular sieves with and without chromium ... chromium location, and chromium concentration. Among protonated H−SAPO-n materials, SAPO-34 shows the highest selectivity for ethene and propene, whereas SAPO-11 shows the longest lifetime for catalytic activity. ... that there is an optimum silicon content in SAPO-34 for the best catalytic activity. Incorporation of Cr into the framework of SAPO-n increases the lifetime and the selectivity toward ...
Tópico(s): Catalysis and Oxidation Reactions
2000 - American Chemical Society | Chemistry of Materials