• synthesis of mesoporous sapo-34 catalysts in the presence

    Synthesis of mesoporous SAPO-34 catalysts in the presence

    Fig. 6 shows that these isotherms are similar in SAPO-34, SAPO-34/CNT, SAPO-34/CNF, and SAPO-34/GO samples and the presence of hysteresis loops at high pressures indicates mesopores. Given the y intercept of the four diagrams, the number of micropores for each sample in increasing order is as follows: SAPO-34 > SAPO-34-CNT > SAPO-34/CNF > SAPO

  • synthesis of mesoporous sapo-34 catalysts in the presence

    Synthesis of mesoporous SAPO-34 catalysts in the presence

    Synthesis of mesoporous SAPO-34 catalysts in the presence of MWCNT, CNF, and GO as hard templates in MTO process Author links open overlay panel Saeed Soltanali a b Jafar Towfighi Darian b Show more

  • synthesis of mesoporous beta catalysts in the presence

    Synthesis of mesoporous beta catalysts in the presence

    Most attention has been paid to ZSM-5 and SAPO-34 catalysts due to their appropriate catalytic activity in MTO process. However, the investigations of other zeolites such as H-Beta zeolite have also been particularly appealing for researchers [, , , , ].

  • synthesis of hierarchical sapo-34 to improve the catalytic

    Synthesis of hierarchical SAPO-34 to improve the catalytic

    Differently from SAPO-34 with acid density of 0.44 mmol g −1 (Fig. 9a), the product distribution over SAPO-34 zeolites with acid densities no more than 0.26 mmol g −1 did not change significantly, and the ratio C 2 C 4 = /C 2 C 4 0 is still as high as 8.3 in the presence of 1 MPa H 2.

  • synthesis of hierarchical sapo-34 and its enhanced catalytic

    Synthesis of hierarchical SAPO-34 and its enhanced catalytic

    Hierarchical SAPO-34 molecular sieve was synthesized hydrothermally in the presence of different concentrations of n-propylamine (NPA) as the mesoporous generating agent. It has been found that the mesoporous structure and morphology of the hierarchical SAPO-34 was depended to the amount of NPA used.

  • mesoporogen‐free synthesis of hierarchical sapo‐34 with low

    Mesoporogen‐Free Synthesis of Hierarchical SAPO‐34 with Low

    Saeed Soltanali, Jafar Towfighi Darian, Synthesis of mesoporous SAPO-34 catalysts in the presence of MWCNT, CNF, and GO as hard templates in MTO process, Powder Technology, 10.1016/j.powtec.2019.07.008, (2019).

  • synthesis of mesoporous sapo-34 molecular sieves and their

    Synthesis of Mesoporous SAPO-34 Molecular Sieves and Their

    By increasing the content of the carbon black template in the synthesis, the mesopore volume increased. Dehydration of alcohols (butanols and ethanol) was carried out with the synthesized SAPO-34 molecular sieves, and the lifetime of the catalysts for the dehydration reaction increased as the mesoporosity increased.

  • synthesis of sapo-34 with the presence of additives and their

    Synthesis of SAPO-34 with the presence of additives and their

    SAPO-34 molecular sieves were synthesized in the presence of soluble starch, sodium dodecyl sulfate and cetyltrimethylammonium bromide as the additives under hydrothermal conditions, and the differences stemmed from the additives among all obtained SAPO-34 samples were characterized by XRD, SEM, BET, NH3-TPD and TG.

  • synthesis of sapo-34 using different combinations of organic

    Synthesis of SAPO-34 Using Different Combinations of Organic

    A mixture of Mor or TEA with TEAOH has shown the cube-like morphology which is the specific characteristic of SAPO-34 with impurities. FE-SEM photographs of M4 and M5 samples exhibited that SAPO-34 crystallization by TEA/TEAOH caused the presence of more impurity and larger particles about 5 μm, whereas using Mor/TEAOH as a templating agent resulted in good material purity with mean

  • a green and cost-effective surfactant-assisted synthesis

    A green and cost-effective surfactant-assisted synthesis

    The SAPO-34 catalysts were successfully synthesized with different amounts of a cheap and green nonionic surfactant (Triton X-100) as a mesoporogen additive and MOR/TEAOH as microporous mixed templates. The prepared samples were characterized and tested in the methanol to olefins (MTO) reaction under the industrial feed composition of 72 wt% methanol in water. The results revealed that the

  • the synthesis of hierarchical sapo-34 and its enhanced

    The Synthesis of Hierarchical SAPO-34 and its Enhanced

    Hierarchical SAPO-34 molecular sieve was successfully synthesized by hydrothermal crystallization method with cetyltrimethyl ammonium bromide as mesoporous generating agent. The influence of different addition amounts of CTAB on the crystalline structures, morphology features, textural properties and acidity of hierarchical SAPO-34 catalysts were characterized by XRD, SEM, BET and NH3-TPD

  • synthesis of mesoporous beta catalysts in the presence

    Synthesis of mesoporous beta catalysts in the presence

    The HZSM-5 sample with optimum ratio of Si/Al = 180 was then added into SAPO-34 synthetic gel to synthesize SAPO-34/HZSM-5 composite. The physicochemical properties and catalytic performance of