Using alkyl pyrrolidine with a structure similar to a five membered ring intermediate as a template,a molecular sieve(LMTW)with MTW topological structure was synthesized by dynamic hydrothermal method under different alkalinity ratio and silica-alumina ratio,and the structure of the molecular sieve was characterized by XRD,N2 adsorption-desorption,SEM,Py-FTIR and electron crystallography.The molecular sieve was used as the acidic component and platinum was loaded onto it to prepare a converted xylene isomerization bi-functional catalyst(Pt/LMTW).The catalytic performance of Pt/LMTW was evaluated using a micro-piston flow reactor and compared with that of Pt/REI-430 catalyst.The experimental results show that the synthesized LMTW has the same characteristic peaks and similar cell parameters as MTW,and during the synthesis process,the alkalinity ratio and silica-alumina mole ratio can affect the pore structure,specific surface area and acidity of the molecular sieve.Compared with Pt/REI-430 catalyst,the prepared Pt/LMTW catalyst has excellent performance for xylene isomerization.
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