Cryptomelane(KxMn8-xO16): Natural active octahedral molecular   sieve(OMS-2)

doi:10.1360/03wd469

CORC > 北京大学 > 地球与空间科学学院

	Cryptomelane(KxMn8-xO16): Natural active octahedral molecular sieve(OMS-2)
	Lu, AH ; Gao, X ; Qin, S ; Wang, CQ
刊名	科学通报英文版
	2003
关键词	cryptomelane natural octahedral molecular sieve xiangtan manganese deposit MANGANESE OXIDE MINERALS K-MN OXIDES SYNTHETIC CRYPTOMELANE AR-40/AR-39 HOLLANDITE STABILITY SIEVES
DOI	10.1360/03wd469
英文摘要	The Xiangtan manganese deposit (XTM) used to be considered a supergene oxide manganese ore in South China. We reported a new identification of the naturally outcropping cryptomelane by examining the physical, chemical and structural features of the XTM supergene oxide manganese ore. The MnO2 content was over 90%, K2O more than 3%, and water from 2.2%-3.1% which is similar to one in zeolite. The cell parameters of the cryptomelane were given as a(0) = 0.9974 nm, b(0) = 0.2863 nm, c(0) = 0.9693 nm and beta = 91.47degrees. There was a larger pseduotetragonal tunnel in the natural cryptomelane that was formed by [MnO6] octahedral double chains with aperture of 0.462 x 0.466 nm(2), filled with K cations resulting in some Mn3+ substituting for Mn4+ to balance the negative charges of structure. The finding is important not only for prospecting manganese resources in South China, but also in application of octahedral molecular sieve of natural cryptomelane as that developed in the tetragonal molecular sieve of natural zeolite over the past century. The XTM cryptomelane (OMS-2) may be the real mineral of the active octahedral molecular sieve in nature.; Multidisciplinary Sciences; SCI(E); 5; ARTICLE; 9; 920-923; 48
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/311421]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Lu, AH,Gao, X,Qin, S,et al. Cryptomelane(KxMn8-xO16): Natural active octahedral molecular sieve(OMS-2)[J]. 科学通报英文版,2003.
APA	Lu, AH,Gao, X,Qin, S,&Wang, CQ.(2003).Cryptomelane(KxMn8-xO16): Natural active octahedral molecular sieve(OMS-2).科学通报英文版.
MLA	Lu, AH,et al."Cryptomelane(KxMn8-xO16): Natural active octahedral molecular sieve(OMS-2)".科学通报英文版 (2003).