NOVELTY - Improving (M1) the efficiency of biomass gasification process involves contacting a volatile organometallic compound with biomass before or during gasification of the biomass.    USE - For improving the efficiency of biomass gasification process; to produce methanol and carbon monoxide; to reduce the formation of tar in a biomass gasification system; in a composition, and in a container (claimed).    ADVANTAGE - The method provides improvement in the gasification efficiency is measured by a percent change increase in gas yields of at least 29.9%, decrease of liquid yields of at least 20.48%, or decrease of solid yields of at least 23.83% relative to the gas, liquid, or solid yield from the gasification of comparable biomass without an organometallic compound; improves gas yields while reducing solid (tar) and liquid yields; leads to increased syngas production and is potentially carbon monoxide neutral; reduce costs and the environmental impact associated with the gasification process; provides methanol, which, in turn, results in a stable liquid and/or oil product from the gasification; provides the increased gas yields at lower temperatures.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) produce (M2) methanol from the biomass involving: contacting an organometallic compound with a biomass before and/or during a gasification process of the biomass; cleaving methoxy substituents on the aromatic rings of materials in the biomass via the organometallic compound to yield methanol; and optionally recovering the methanol produced as a product of the gasification;    (2) produce (M3) carbon monoxide from the biomass involving: contacting an organometallic compound with a biomass before or during gasification of the biomass, where the biomass comprises components having carbonyl and hydroxyl functional groups; causing the catalytic decarbonylation of carbonyl functionalities derived from ketonyl and aldehydic functional groups, carbonyl functionalities from oxidation of hydroxyl groups to ketonyl and aldehydic functional groups, and decarboxylation of carboxyl functional groups to produce a mixture of gases, the mixture including carbon monoxide, carbon dioxide, and hydrogen; and optionally converting the carbon dioxide to carbon monoxide by a water gas shift reaction;    (3) reduce (M4) the formation of tar in a biomass gasification system involving contacting a volatile organometallic compound with a biomass before or during gasification of the biomass, where the gasification product produced contains less tar than does the product produced from the gasification of biomass in the absence of the volatile organometallic compound;    (4) a composition comprising: a biomass; and an amount of a volatile organometallic compound, the volatile organometallic compound provided to catalyze the gasification of the biomass or increase gas yields from the gasification of the biomass; and    (5) a container comprising: a biomass vessel containing an amount of biomass; and an organometallic compound, the organometallic compound comprising the biomass (at least 1 mass.%).