Xu Ruren

First syntheses of pentasil-type silica zeolites from non-aqueous systems

Several pentasil-type silica zeolites (silicalite-1, ZSM-39, and ZSM-48) have been synthesized from non-aqueous systems in the presence of specific templating agents and characterized by means of composition analysis and X-ray powder diffraction.

The Synthesis, Crystallization and Structure of Heteroatom Containing ZSM-5 Type Zeolite (M-ZSM-5)

In this report we summarize the syntheses, the crystallization kinetic model, the crystal structure and the characterization of Heteroatom containing ZSM-5 (M-ZSM-5) type zeolites (M=Ga, In, R.E., Si, Ge, Sn, Ti(IV, III) Zr, V(V, IV, III,), Cr, Mo, W, Mn and Fe). Much of discussion which follows will be related to the more recent available results obtained in our laboratory.

Studies on the Transformation Between Erionite and Offretite in T-Type Zeolite

T-type zeolite and its transformation, including a stabilized form, have been characterized by capacity of adsorption, X-ray diffraction and electron diffraction, thermal technique and the changes of the composition of liq. phase in the course of crystallization. (change-para-here) The relation of the transformation between erionite and offretite in T-type zeolite was suggested.

The influence of the templating agent on the unit cell volume of ZSM-5 zeolite

The XRD technique was used to study the lattice parameters a, b, and c and unit cell volume V of several groups of zeolite ZSM-5 synthesized with different templating agents. When the templating agent was changed, the V changed greatly and the a parameter increased greatly whereas b and c did not change significantly. This result supports the conclusion that the ZSM-5 crystal grows through one by one combination of bc sheets along the a direction.

A novel mixed octahedral–tetrahedral framework: X-ray characterization of a microporous gallophosphate, Ga2P2O8(OH)H2O·NH4·H2O·0.16 PrOH (GaPO4-C7)

The structure of the microporous gallophosphate, Ga2P2O8(OH)H2O·NH 4·H2O·0.16 PrOH, consists of gallium-centred octahedra and phosphorus-centred tetrahedra as basic building units to form three-dimensional channels with the 8-ring running along the a,b, and c axes in which NH4+ cations are located in pairs.

Crystal structure of the gallophosphate framework: X-ray characterization of Ga9P9O36OH·HNEt3

A gallophosphate, Ga9P9O36OH·HNEt3, has been synthesised and its framework structure has been determined by single crystal X-ray diffraction.

The Mechanism of Transformation of NaY to NaPc Type Zeolites

We investigated the crystallization of NaY and especially the transformation of NaY to NaPc type zeolites from an initial gel of the batch composition 3.3Na 2 O.Al 2 O 3 ·1OSiO 2 ·2OOH 2 O at 100° C and the changes of zeolite structures in the process of the transformation cf crystal by using modern techniques. A more detailed liquid phase transportation mechanism of the transformation is suggested.

The Templating Effect during the Formation of ZSM-5 Type Zeolite

13 C solid-state MAS NMR, and 23 Na solid-state MAS NMR technique, thermal analysis and chemical analysis were used to investigate ZSM-5 type zeolite synthesized with organic compounds and direct method. As a result, a mechanism of templating effect during the formation of ZSM-5 type zeolite and the model of “positive charge tetrahedron” templating agent were proposed.

Syntheses of AlPO4-5, AlPO4-11, and AlPO4-21 from non-aqueous systems

Several aluminophosphate molecular sieves (AlPO4-5, AlPO4-11, and AIPO4-21) have been synthesized from non-aqueous systems in the presence of organic amine templating agents.

Synthesis and characterization of a novel microporous alumino-borate

A novel microporous alumino-borate, named B–C7, has been synthesized from CaO–Al2O3–B2O3–(TEA)2O–H2O systems (TEA = tetraethylammonium), and characterized by means of X-ray powder diffraction, infrared, composition, thermal analyses, and gas adsorption.