THERMAL-STABILITY OF (B)ZSM-5 MOLECULAR-SIEVE

被引：6

作者：

HONG, SB ^{[1
]}

UH, YS ^{[1
]}

WOO, SI ^{[1
]}

LEE, JK ^{[1
]}

机构：

[1] KOREA ADV INST SCI & TECHNOL,DEPT CHEM ENGN,POB 150,SEOUL 131,SOUTH KOREA

来源：

KOREAN JOURNAL OF CHEMICAL ENGINEERING | 1991年 / 8卷 / 01期

关键词：

D O I：

10.1007/BF02697690

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The thermal stability of [B]ZSM-5 (boronsilicalite) has been examined by IR, XRD, B-11 MAS NMR and XPS techniques. [B]ZSM-5 and amorphous borosilicate were converted to alpha-cristobalite at high temperatures (= 750-degrees-C). However, Na-free amorphous borosilicate was not converted to alpha-cristobalite at 750-degrees-C. Therefore, the presence of Na+ ions in [B]ZSM-5 would determine whether this transition occurred or not. When the phase transition to alpha-cristobalite occurred, most of B atoms tetrahedrally coordinated were released from the ZSM-5 structure and migrated to the exterior surface as a boron compound having trigonal BO3 units and oxidation states of 3.

引用

页码：1 / 5

页数：5

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