Morphology of titania coatings on silica gel

被引:49
作者
Hanprasopwattana, A
Rieker, T
Sault, AG
Datye, AK
机构
[1] UNIV NEW MEXICO,DEPT CHEM & NUCL ENGN,ALBUQUERQUE,NM 87131
[2] UNIV NEW MEXICO,CTR MICROENGINEERED CERAM,ALBUQUERQUE,NM 87131
[3] UNIV NEW MEXICO,DEPT CHEM,ALBUQUERQUE,NM 87131
[4] SANDIA NATL LABS,CATALYSIS & CHEM TECHNOL DEPT,ALBUQUERQUE,NM 87185
关键词
preparation of titania/silica; isopropanol dehydration as a probe of titania/silica; transmission electron microscopy of titania/silica; small angle X-ray scattering of titania/silica; thermal stability of supported titania; nanostructured titania/silica;
D O I
10.1023/A:1019096419053
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Control of the hydrolysis and condensation of soluble precursors of titanium is shown to yield oxide coatings of well-defined morphology. A ''smooth'' coating, consisting of patches of titania on silica, causes only a small increase in the surface area, from 130 m(2)/g for the uncoated silica gel to 154 m(2)/g. On the other hand, the ''rough'' coating, which consists of 3 nm diameter titania particles dispersed over the silica surface, results in an increase in the BET surface area to 350 m(2)/g. The specific titania surface area was determined via isopropanol dehydration activity and was found to be comparable to the BET surface area indicating that the titania phase is responsible for the increase in surface area. Small angle X-ray scattering (SAXS) and transmission electron microscopy (TEM) provide definitive evidence for the coating morphology while X-ray photoelectron spectroscopy (XPS) was used to determine the dispersion of the titania. The supported titania maintains its surface area upon calcination at temperatures up to 873 K while unsupported titania looses much of its surface area. Also demonstrated in this work is a novel preparation method using titanium bis-ammonium lactate dihydroxide (TALH), a water soluble precursor.
引用
收藏
页码:165 / 175
页数:11
相关论文
共 25 条
[1]   SELECTIVE CATALYTIC REDUCTION OF NITRIC-OXIDE WITH AMMONIA .1. MONOLAYER AND MULTILAYERS OF VANADIA SUPPORTED ON TITANIA [J].
BAIKER, A ;
DOLLENMEIER, P ;
GLINSKI, M ;
RELLER, A .
APPLIED CATALYSIS, 1987, 35 (02) :351-364
[3]   A METHOD FOR MEASURING THE TITANIA SURFACE-AREA ON MIXED OXIDES OF TITANIA AND SILICA [J].
BIAGLOW, AI ;
GORTE, RJ ;
SRINIVASAN, S ;
DATYE, AK .
CATALYSIS LETTERS, 1992, 13 (04) :313-321
[4]   BORON-NITRIDE COATINGS ON OXIDE SUBSTRATES - ROLE OF SURFACE MODIFICATIONS [J].
BOREK, TT ;
QIU, XM ;
RAYFUSE, LM ;
DATYE, AK ;
PAINE, RT ;
ALLARD, LF .
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1991, 74 (10) :2587-2591
[5]   INFLUENCE OF PREPARATION METHODS ON THE TEXTURE AND STRUCTURE OF TITANIA-SUPPORTED ON SILICA [J].
CASTILLO, R ;
KOCH, B ;
RUIZ, P ;
DELMON, B .
JOURNAL OF MATERIALS CHEMISTRY, 1994, 4 (06) :903-906
[6]   Influence of the amount of titania on the texture and structure of titania supported on silica [J].
Castillo, R ;
Koch, B ;
Ruiz, P ;
Delmon, B .
JOURNAL OF CATALYSIS, 1996, 161 (02) :524-529
[7]   Oxide supported MoS2 catalysts of unusual morphology [J].
Datye, AK ;
Srinivasan, S ;
Allard, LF ;
Peden, CHF ;
Brenner, JR ;
Thompson, LT .
JOURNAL OF CATALYSIS, 1996, 158 (01) :205-216
[8]  
DRAKE JM, 1986, MATER RES SOC S P, V73, P305
[9]   SPECTROSCOPIC CHARACTERIZATION OF TIO2/SIO2 CATALYSTS [J].
FERNANDEZ, A ;
LEYRER, J ;
GONZALEZELIPE, AR ;
MUNUERA, G ;
KNOZINGER, H .
JOURNAL OF CATALYSIS, 1988, 112 (02) :489-494
[10]   A METHOD FOR ACCURATE QUANTITATIVE XPS ANALYSIS OF MULTIMETALLIC OR MULTIPHASE CATALYSTS ON SUPPORT PARTICLES [J].
FRYDMAN, A ;
CASTNER, DG ;
SCHMAL, M ;
CAMPBELL, CT .
JOURNAL OF CATALYSIS, 1995, 157 (01) :133-144