TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preparation (Claimed): Preparation of (I) comprises: either hydrogenating or dehalogenating (II) to give (I); or (a) reacting a scaffold material containing a functional group formed on the surface with (III-B) to give (III), and (b) hydrogenating (III) to give (I). Preferred Components: The scaffold material is inorganic oxide, carbon substance or metal organic framework (MOF). The inorganic oxide is oxide(s) of titanium, aluminum, silicon, vanadium, zirconium, niobium, hafnium and/or tantalum, preferably silica, titania, zirconia and/or zeolite. The carbon substance is carbon nanotubes, graphite, carbon nanofiber, carbon nanohorn and/or fullerenes. The metal organic framework comprises metal (M2) and organic linkers (L1) as the framework. The organic linker is of formula ((G1)a-A-(G2b)) (VII) containing a functional group (G1) to be linked to the metal (M2) ion in the metal organic framework and a functional group (G2) to be linked to (I-A). The metal (M2) is lithium ion (Li+), sodium ion (Na+), potassium ion (K+), rubidium ion (Rb+), beryllium ion (Be2+), magnesium ion (Mg2+), calcium ion (Ca2+), strontium ion (Sr2+), barium ion (Ba2+), scandium ion (Sc3+), yttrium ion (Y3+), titanium ion (Ti4+), zirconium ion (Zr4+), hafnium ion (Hf+), vanadium ion (V4+, V3+, or V2+), niobium ion (Nb3+), tantalum ion (Ta3+), chromium ion (Cr3+), molybdenum ion (Mo3+), tungsten ion (W3+), manganese ion (Mn3+ or Mn2+), rhenium ion (Re3+ or Re2+), iron ion (Fe3+ or Fe2+), ruthenium ion (Ru3+ or Ru2+), osmium ion (Os3+ or Os2+), cobalt ion (Co3+ or Co2+), rhodium ion (Rh2+ or Rh+), iridium ion (Ir2+ or Ir+), nickel ion (Ni2+ or Ni+), palladium ion (Pd2+ or Pd+), platinum ion (Pt2+ or Pt+), copper ion (Cu2+ or Cu+), silver ion (Ag+), gold ion (Au+), zinc ion (Zn2+), cadmium ion (Cd2+), mercury ion (Hg2+), aluminum ion (Al3+), gallium ion (Ga3+), indium ion (In3+), thallium ion (Tl3+), silicon ion (Si4+ or Si2+), germanium ion (Ge4+ or Ge2+), tin ion (Sn4+ or Sn2+), lead ion (Pb4+ or Pb2+), arsenic ion (As5+, As3+ or As+), antimony ion (Sb5+, Sb3+ or Sb+), or bismuth ion (Bi5+, Bi3+ or Bi+).A = 1-20C alkylene (where (2-20C)alkylene optionally comprise unsaturated bonds), 3-8C cycloalkylene, 6-20C arylene, 6-20C ar(1-20C)alkylene, (1-20C)alkyl(6-20C)arylene or (8-20C) fused ring (preferably phenylene, naphthylene, biphenylene, terphenylene, anthrylene, pyrenylene or perylenylene), where in the arylene and alkylene the C is optionally replaced by N, O, S or Si, and are optionally substituted by -(CO)R31, -(SO2)R32, -(CO2)R33, -SR34, -NO2, -Si(R35)(R36)(R37) or -BR38;G1 = -COO-;a = 2-4, preferably 2 or 3;G2 = -OH, -SH, COOR41, -NH2, -NHR42, -NR43R44, -PH2, -PHR45, -PR46R47, -SO3R48, -PO3HR49 or -PO3R50;b = 1-15, preferably 1-10;R31-R38, R42-R47 = (1-20C)alkyl, (3-8C)cycloalkyl, (6-20C)aryl, (6-20C)ar(1-20C)alkyl or (1-20C)alkyl(6-20C)aryl;R41, R48, R49 = H or alkali metal; andR50 = alkaline earth metal.Preferred Process: In the process: the reaction (a) is carried out at -80 degrees C to 100 degrees C for 3-50 hours; the reaction mixture after (a) and (b) is dried in vacuo for 24 hours using Schlenk method, or subjected to chemical extraction process with supercritical carbon dioxide; (b) is carried out in gas phase or liquid phase; the gas phase reaction is carried out by using hydrogen, or a mixture of hydrogen and at least one inert gas; the liquid phase reaction is carried out by using at least one solvent comprising (1-10C) saturated aliphatic hydrocarbons or (6-20C) aromatic hydrocarbons; the gas phase reaction is carried out at 25-1000 degrees C, pressure of 1-50 atm, for 1-100 hours; the liquid phase reaction is carried out at 25-400 degrees C for 1-100 hours; and the loading of (III) per volume of the reactor in the gas phase or liquid phase reaction is 0.001-1 g/ml. Preferred Definitions:    SM = scaffold material containing functional group consisting of -OH, -SH, -COOR21, -NH2, -HNR22, -NR23R24, -PH2, -PHR25, -PR26R27, -SO3R28, -PO3HR29 or -PO3R30;    R21, R28, R29 = H or alkali metal;    R22-R27 = 1-20C alkyl, 3-8C cycloalkyl, 6-20C aryl, 6-20C ar(1-20C)alkyl or (1-20C)alkyl(6-20C)aryl;    R30 = alkaline earth metal;    L = N(CH2CH2-O-)3, P(CH2CH2-O-)3, SH(CH2CH2-O-)3, N(CH2CH(CH3)-O-)3, N(CH2CH2CH2-O-)3, N(CH(CH3)CH2-O-)3, H3C-CH2-CH(CH2-O-)N(CH(CH3)CH2-O-)CH(CH3)CH(CH3)-O-, (H3C)2-N-CH2-, H3CCH2-N(CH3)CH2-, (H3C-CH2)2-N-CH2-, (benzyl(ethyl)amino)methanide, H3C-CH2-O-, H3C-CH(CH3)-O-, H3C-CH2-CH(CH3)-O-, phenolate, H3C-CH2-S-, H3C-CH(CH3)-S-, H3C-CH2-CH(CH3)-S-, benzenethiolate, (H3C)2-P-CH2-, H3CCH2-P(CH3)CH2-, (H3C-CH2)2-P-CH2- or (benzyl(ethyl)phosphino)methanide; and    M1 = Ti, V or Sc.    EXAMPLE - In a two-necked round-bottomed flask, mesoporous silica containing hydroxy (-OH) groups on the surface (-OH group 1 mmol/g) (0.5 g) was dispersed in benzene (50 ml) under argon atmosphere to give reactant M. In a one-necked round-bottomed flask tetrapropyltitanium (5 mmol) was dissolved in benzene (30 ml) to give reactant N. Reactant M was stirred for 1 hour, and then Reactant N was slowly dropped to Reactant M, with reflux at 25 degrees C for 20 hours. Under argon atmosphere, benzene was removed via Schlenk method, and benzene as reaction solvent was applied as organic solvent for purification to filter off unreacted tetrapropyltitanium. Then, benzene was removed via Schlenk method to give mesoporous silica-O-transition metal ligand complex (A1). To a continuous reactor (A1) (0.13 g) was loaded, and hydrogen gas was flushed under ambient pressure. The temperature inside the reactor was then raised to 400 degrees C and maintained for 1 hour. Then, hydrogen pressure inside the reactor was raised to 10 atm, which was maintained for 5.5 hours, and worked up to give mesoporous silica-O-transition metal hydride complex.