scholarly journals Catalytic conversion of glucose in fructose utilizing high-silica zeolite Sn-ZSM-12

Cerâmica ◽  
2020 ◽  
Vol 66 (379) ◽  
pp. 221-228
Author(s):  
I. da Silva ◽  
A. O. S. Silva ◽  
J. R. Santos ◽  
R. C. S. Nascimento ◽  
J. M. Ferreira ◽  
...  
Keyword(s):  
Catalytic Conversion ◽  
Isomerization Reaction ◽  
Tetraethylammonium Bromide ◽  
Tetraethylammonium Hydroxide ◽  
High Silica ◽  
Structure Directing Agents ◽  
Tin Content ◽  
Glucose Isomerization

Abstract Tin incorporation in high-silica ZSM-12 zeolite was evaluated using different concentrations of tin and different structure-directing agents (SDA), in order to be used in the glucose isomerization reaction in fructose. The tetraethylammonium hydroxide SDA successfully formed the structure of the high silica zeolite ZSM-12; however, in this system, the addition of Sn prevented the formation of the ZSM-12 zeolite. Therefore, tetraethylammonium bromide was used as SDA, but the syntheses of high-silica ZSM-12 zeolite without and with tin incorporation were not effective. Then methyltriethylammonium chloride was used as SDA, and the high-silica ZSM-12 structure was formed only with the incorporation of tin. The samples with ZSM-12 structure and different concentrations of tin were evaluated in reaction of glucose conversion to fructose. It was found that the sample with the lowest tin content ( Sn / Si = 0 . 005 ) achieved the highest glucose conversion and the highest fructose yield.

scholarly journals Alcohol-assisted synthesis of high-silica zeolites in the absence of organic structure-directing agents

2021 ◽  
Vol 42 (4) ◽  
pp. 563-570
Author(s):  
Huimin Luan ◽  
Chi Lei ◽  
Ye Ma ◽  
Qinming Wu ◽  
Longfeng Zhu ◽  
...  
Keyword(s):  
Organic Structure ◽  
High Silica ◽  
High Silica Zeolites ◽  
Structure Directing Agents

scholarly journals Selective catalytic conversion of bio-oil over high-silica zeolites

2015 ◽  
Vol 179 ◽  
pp. 518-523 ◽  
Author(s):  
Wahyu Bambang Widayatno ◽  
Guoqing Guan ◽  
Jenny Rizkiana ◽  
Xiao Du ◽  
Xiaogang Hao ◽  
...  
Keyword(s):  
Catalytic Conversion ◽  
Bio Oil ◽  
High Silica ◽  
High Silica Zeolites

Thorough investigation of varying template combinations on SAPO-34 synthesis, catalytic activity and stability in the methanol conversion to light olefin

RSC Advances ◽  
2014 ◽  
Vol 4 (91) ◽  
pp. 49762-49769 ◽  
Author(s):  
Mehdi Sedighi ◽  
Hussein Bahrami ◽  
Jafar Towfighi Darian
Keyword(s):  
Catalytic Activity ◽  
Molecular Sieves ◽  
Methanol Conversion ◽  
Hydrothermal Conditions ◽  
Light Olefin ◽  
Tetraethylammonium Hydroxide ◽  
Structure Directing Agents

Crystals of SAPO-34 molecular sieves were synthesized under hydrothermal conditions by using tetraethylammonium hydroxide, morpholine and a mixture of them as structure-directing agents.

Hydrothermal synthesis of high silica zeolite Y using tetraethylammonium hydroxide as a structure-directing agent

2016 ◽  
Vol 52 (86) ◽  
pp. 12765-12768 ◽  
Author(s):  
Dawei He ◽  
Danhua Yuan ◽  
Zhijia Song ◽  
Yansi Tong ◽  
Yaqi Wu ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Hydrothermal Synthesis ◽  
Zeolite Y ◽  
Hydrothermal Stability ◽  
Structure Directing Agent ◽  
Tetraethylammonium Hydroxide ◽  
High Silica

Zeolite Y with a SiO2/Al2O3 ratio of 7.76 and outstanding thermal stability and hydrothermal stability is synthesized using TEAOH as an SDA.

Structural and High Resolution Studies Of B-Zeolite Catalysts Using TEM and Fourier Transform Processing Techniques

1987 ◽  
Vol 111 ◽  
Author(s):  
Miguel Jóse-Yacamán ◽  
J. G. Pérez-Ramírez ◽  
D. R. Acosta ◽  
J. P. Gilson ◽  
G. C. Edwards
Keyword(s):  
Fourier Transform ◽  
High Resolution ◽  
Zeolite Beta ◽  
Zeolite Catalysts ◽  
Shale Oil ◽  
Organic Template ◽  
Tetraethylammonium Hydroxide ◽  
High Silica ◽  
Selective Adsorbent ◽  
Processing Techniques

Zeolite Beta, synthesized in 1967 (1), is the first example of a large pore, high silica zeolite (SiO2O3 > 20) prepared in the presence of an organic template (Tetraethylammonium Hydroxide). Zeolite NU-2, whose synthesis has been reported in 1982 (2) seems to be related to the zeolite Beta. Although Zeolite Beta has been claimed as useful catalyst in hydrocracking (3), cracking (4), dewaxing (5), hydrotreating (6), shale oil (7) and Fisher-Tropsh products (B) conversions and as a selective adsorbent in the separation of alkylaromatics (9); this zeolite has not been extensively characterized in the open literature.

scholarly journals The Recovery of Metallic Tin from an Industrial Tin-Bearing By-Product Containing Na2SO4 by Reduction Smelting Process

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1697
Author(s):  
Jongshin Chang ◽  
Hosang Sohn
Keyword(s):  
High Temperature ◽  
Reaction Time ◽  
Recovery Rate ◽  
Carbothermic Reduction ◽  
Smelting Process ◽  
Silicate Slag ◽  
Reduction Smelting ◽  
High Silica ◽  
Slag Temperature ◽  
Tin Content

Tin was recovered in metal from an industrial tin-bearing byproduct containing Na2SO4 by carbothermic reduction smelting, and the effects of basicity (Na2O/SiO2), temperature, and reaction time on the recovery of tin were studied. Na2SO4 was reduced by carbon and formed into sodium silicate slag (Na2O–SiO2) in the presence of SiO2. Tin content in slag decreased with the increase of Na2O/SiO2 ratio in slag, temperature, and reaction time, but the recovery of tin was affected by volatilization of tin in high temperature and high silica region of basicity. In this study, the maximum recovery rate of tin was 94.8% at the experimental condition of 1200 °C, 2 h, and 0.55 of Na2O/SiO2 ratio. The major impurities in produced metal were Bi, Pb, Cu, Fe, and most of Bi, Pb, Cu were distributed to the metal phase, but the distribution of Fe was closely related to basicity.

scholarly journals Synthesis of SAPO-34 Using Different Combinations of Organic Structure-Directing Agents

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Tuan Doan ◽  
Khang Nguyen ◽  
Phong Dam ◽  
Thanh Huyen Vuong ◽  
Minh Thang Le ◽  
...  
Keyword(s):  
Surface Area ◽  
Crystal Size ◽  
High Surface ◽  
High Surface Area ◽  
Physicochemical Characteristics ◽  
29Si Nmr ◽  
Organic Structure ◽  
Tetraethylammonium Hydroxide ◽  
Volume Measurements ◽  
Structure Directing Agents

The effects of different mixtures of organic structure-directing agents (OSDAs) on the formation of SAPO-34 structure have been investigated. Different OSDAs, namely, triethylamine (TEA), tetraethylammonium hydroxide (TEAOH), and morpholine (Mor) and their combinations were used to synthesize SAPO-34 by a hydrothermal method. The template concentration was optimized by eliminating the competing phases to obtain the purest form of SAPO-34 phase. The as-synthesized samples were analyzed by XRD, FE-SEM/EDS, FT-IR, surface area/pore volume measurements, NH3-TPD, TG/DTA, and 29Si NMR MAS. The selection of template notably impacts the crystal size and physicochemical characteristics of as-synthesized SAPO-34. The sample prepared with 3 Mor : 3 TEA : 1 TEAOH exhibited the highest total acidity, smallest crystal size below 3 µm, and high surface area up to 697 m2/g.

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