I don't know if Luxembourg had a chevalerie/ ridderschap / ritterschaft (board of knights) as Luxembourg had a status aparte compared with provinces as Liège, Brabant, Hainaut, Gelderland, etc. These provinces were part of the Kingdom of the Netherlands. The Grand-Duchy of Luxembourg was an independent entity with the King as Grand-Duke. The same applied to the Duchy of Limbourg. It was only decades later that Limbourg became a normal province, but it had a ridderschap.
In the first Nobility Act of Willem I, King of the Netherlands, Grand-Duke of Luxembourg, Duke of Limbourg is to read:
Art 63 Constitution
The King elevates into the Nobility;
Anyone who has been elevated into the Nobility gives notice of that by showing the Letters of Patent to the States of their province;
And is consequently gifted with the privileges attached to the Nobility;
In particular by being registered into in the ridderschap (board of knights) of the province.
The question is if Luxembourg indeed had an own ridderschap. We could consider that as a sort of "Luxembourgian Nobility". By the way: such a ridderschap was not only a political vehicle. Members of the ridderschap had hunting rights in the whole province (which would have been a great pro in such a big, green and sparsely inhabited area as Luxembourg, back then three sizes bigger than the current Grand-Duchy). And some other privileges besides these hunting rights, like a seat in the Water, or Land, or Forest Authorities.
Thank you and Duc_et_Pair for the research. 
